From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Methods for returning oil from actuating cylinders to the master cylinder chamber using engine vacuum.
| Identifier | ExFiles\Box 84\2\ scan0012 | |
| Date | 2nd November 1932 guessed | |
| (2) As regards returning the oil from the actuating cyls. to the master cyl. chamber should this be found desirable, I suggest that we can use the vacuum of the engine, but I should only use this vacuum while the brakes were on. It would necessitate a system of pipes to the 4 dampers, but they could be in series or in parallel by arranging a restriction and ventilating holes accordingly, that is, there need not be a separate pipe to each damper. The reason being the large capacity of the engine vacuum combined with the restriction would clear the oil out of the last one even though 3 were clear of oil. An alternative way of arranging it would be to put them all in series with a ventilating hole in the last. In this case small restrictions are not necessary. There would be a supplementary reservoir for such a sch. with a valve worked in unison with the master piston, as will be further explained by DA{Bernard Day - Chassis Design}'s notes. R.{Sir Henry Royce} | ||